“Echocardiography and 6-Minute Walk Test for Assessing Disease Progression in Systemic Lupus Erythematosus”, ccm, vol. 3, no. 4, pp. 221–235, Aug. 2019, Accessed: Sep. 18, 2026. Available: https://fortunejournals.org/ojs/index.php/ccm/article/view/15691